有效散热面积对电力电容器外壳散热量的灵敏度分析

Sensitivity Analysis on Effective Heat Dissipation Area to Heat Dissipating Capacity of Power Capacitor Shell

在介绍电容器传热过程数学模型的基础上,运用局部灵敏度分析方法,进行了有效散热面积对电容器外壳散热量的灵敏度分析,得到其灵敏度系数与电容器外壳温度、冷却空气温度之间的关系。实际算例分析表明,在额定电压及容量相同的情况下,相对于较小尺寸电容器,较大尺寸电容器的内部介质温度及外壳温度可降低2℃以内。

On basis of introducing heat transmission process mathematical model of capacitor and by using partial sensitivity analysis method, this paper analyzes the sensitivity of effective heat dissipation area to heat dissipation capacity of capacitor,then draws a conclusion of relations between sensitivity coefficient and temperature of the capacitor shell and cooling air. The practical computation indicates that under the condition of the same rated voltage and capacity, the capacitor in largersize can reduce less than 2℃ of its inner medium temperature and shell temperature compared with that in smaller size.